Formaldehyde Preparation Assignment Help

Preparation of Formaldehyde

Formaldehyde is the first member of the aldehyde series. It is present in green leaves of plants where its presence is supposed to be due to the reaction of CO2 with water in presence of sunlight and chlorophyll.

(1) Preparation

Platinised asbestos

(i) 2CH3 OH + O2 ——————————→ HCHO

300 - 400oC Formaldehy de

K2Cr2O7

CH3 OH +[ O ] ———————→ HCHO + H2O

H2 SO4

Cu or Ag

(ii) CH3 OH ———————→ HCHO

300 - 400oC Formaldehy de

Heat

(iii) Ca ( HCOO )2 —————→ HCHO

Calcium formate Formaldehy de

H2

(iv) CH2 = CH2 + O3 —————→ HCHO

Pd

No - oxide

(v) CH4 + O2 —————→ HCHO

Catalyst Formaldehy de

Elec. discharge

(vi) CO + H2 —————→ HCHO

Formaldehy de

Example 1: Which of the following compound gives a ketone with Grignard reagent

(a) Formaldehyde (b) Ethyl alcohol

(c) Methyl cyanide (d) Methyl iodide

Ans: a

Example 2: Hydrolysis of ozonide of 1-butene gives

(a) Ethylene only

(b) Acetaldehyde and Formaldehyde

(c) Propionaldehyde and Formaldehyde

(d) Acetaldehyde only

(e) Acetaldehyde and Oxalic acid

Ans: c

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